Yeast Infection vs. Bacterial Vaginosis: How to Tell the Difference

Noticing unusual discharge, an unfamiliar smell, or persistent itching down there can trigger a wave of questions all at once: Is this normal? Did I do something wrong? Should I be embarrassed to bring this up, even to my own partner? Take a breath — vaginal discomfort is one of the most common reproductive health experiences a woman will have in her lifetime, and needing to understand it isn't a sign that something is fundamentally wrong with you. Two of the most frequent causes behind these symptoms are yeast infections and bacterial vaginosis (BV). They can feel similar in the moment of discomfort, but they come from different imbalances in the body, and knowing which one you're dealing with changes what actually helps.

What's actually happening in each case

A yeast infection develops when Candida, a fungus that lives in small, harmless amounts in a healthy vagina, suddenly multiplies out of control. This overgrowth is often triggered by antibiotics (which wipe out the protective bacteria that normally keep yeast in check), hormonal shifts around your period or pregnancy, high blood sugar, or even tight, non-breathable clothing that traps moisture. The result is usually thick, white, clumpy discharge, along with intense itching, redness, and sometimes a burning sensation during urination or intercourse.

Bacterial vaginosis works differently. It happens when the vagina's natural bacterial ecosystem — normally dominated by protective Lactobacillus bacteria — shifts to allow other types of bacteria to overgrow. Rather than a fungal issue, this is a bacterial imbalance, and it tends to produce thinner, grayish-white discharge with a distinct fishy odor that often becomes more noticeable after sex, since semen changes the vaginal pH temporarily.

Key signs to help you tell them apart

• Yeast infection: thick, white, cottage-cheese-like discharge; intense itching and redness; little to no strong odor; burning during urination is common
• Bacterial vaginosis: thin, grayish or watery discharge; a noticeable fishy smell, especially after intercourse; itching is usually milder than with a yeast infection
• Overlap to be aware of: both can cause general vaginal irritation and discomfort, and it's genuinely common for women to have both conditions at different points, or even mistake one for the other

Why this matters beyond just comfort

It's easy to think of these as "just an annoyance," but your vaginal environment is directly connected to your reproductive health. A balanced vaginal pH and healthy bacterial flora help create the kind of environment sperm need to survive and travel through the cervix. Recurring infections, left unaddressed, can sometimes irritate the cervix and vaginal tissue over time, which is one more reason many women trying to conceive choose to pay closer attention to gynecological health as part of their overall preparation — not out of fear, but as one more piece of a well-rounded care routine.

Why it's worth getting the diagnosis right

Because yeast infections and BV need fundamentally different treatments — antifungal for one, antibacterial for the other — guessing and self-treating based on internet searches can sometimes make things worse or simply waste time while the real issue continues. If your symptoms are new, unusual, or don't resolve with an over-the-counter product within a few days, it's worth getting a proper diagnosis rather than continuing to guess.

How a provider tells them apart

The good news is that telling yeast from BV is usually quick and simple in a clinic. After asking about your symptoms, a provider may take a gentle swab of discharge and check a few things:

• pH level: pH measures how acidic the vagina is. With a yeast infection, pH usually stays in the normal, more acidic range. With BV, it's often higher than normal.
• A look under the microscope: Yeast cells look very different from the bacterial changes seen with BV.
• A simple odor test: A fishy smell that gets stronger during this test points toward BV.
• Lab tests: If the cause still isn't clear, or infections keep returning, the sample may be sent for a culture or other tests, including for STIs like trichomoniasis.

There are also home vaginal pH kits. They can give a hint, but they can't confirm the cause, so they don't replace an exam.

When to see a doctor instead of self-treating

• It's your first time having these symptoms.
• You notice a fishy odor or gray discharge. Over-the-counter yeast products won't help BV, and a doctor may discuss prescription options.
• You are pregnant or trying to conceive.
• Symptoms haven't improved after an over-the-counter yeast treatment, or they come back within two months.
• You have fever, pelvic pain, sores, or you may have been exposed to an STI.

If infections keep coming back, our guide to recurring yeast infections and BV covers common triggers and what to ask your provider.

Daily habits that help with both

• Wash the outside area with warm water or a mild, unscented cleanser. Skip douching, which is linked to a higher risk of BV.
• Choose cotton underwear and change out of damp workout clothes or swimwear soon.
• Avoid scented pads, liners, sprays, and bubble baths.
• Use condoms if you notice BV symptoms often after sex.
• Only take antibiotics when they're prescribed, and finish any treatment you start.

Not sure what your discharge is telling you? Our guide to discharge colors and textures can help.

Supporting your body's natural balance

Alongside proper diagnosis and treatment when needed, many women choose to support their vaginal and gynecological health on an ongoing basis — not just when something feels wrong. This is exactly the thinking behind AGO Eva: formulated to help support a healthy vaginal environment, natural balance, and everyday gynecological comfort, so your body has a stronger foundation to maintain that balance on its own between flare-ups.